Alexander Campbell Martin / Arthur Henry Senner / C. C. Plummer / C. H. Hadley / Chalmers Jackson King / Curtis Paul Clausen / David A. Savage / Ernest Victor Abbott / Frederick Charles Lincoln / Glenn Gardner Hahn / Harold Francis Scholz / Harold Glenn Meginnis / J. Clark Salyer / James Herbert Beattie / Jenkin William Jones / Mayne Reid Coe / Paul William Miller / Ralph P. Hotis / Robert J. Sim / United States. Department of Agriculture / Walter Ernest Fleming / Wilbur Clifford Edmundson / Wilbur Magruder Hurst / Claude Hope / Frederick William Metzger / Ira Myron Hawley / James Robert McCalmont / John Walter Taylor / Victor Rickman Boswell / Walter Raymond Humphries / William Ernest Stone / E. E. Hall / Max Raymond Osburn / Roland McKee | 